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batman-adv: Convert batadv_softif_vlan to kref 

batman-adv uses a self-written reference implementation which is just based
on atomic_t. This is less obvious when reading the code than kref and
therefore increases the change that the reference counting will be missed.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
This commit is contained in:
Sven Eckelmann 2016-01-16 10:29:42 +01:00 committed by Antonio Quartulli
parent e7aed321b8
commit 6be4d30c18
3 changed files with 26 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
net/batman-adv/soft-interface.c
View File

@ -30,6 +30,7 @@
#include <linux/if_vlan.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
@ -477,9 +478,27 @@ void batadv_interface_rx(struct net_device *soft_iface,
return;
}
/**
* batadv_softif_vlan_release - release vlan from lists and queue for free after
* rcu grace period
* @ref: kref pointer of the vlan object
*/
static void batadv_softif_vlan_release(struct kref *ref)
{
struct batadv_softif_vlan *vlan;
vlan = container_of(ref, struct batadv_softif_vlan, refcount);
spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
hlist_del_rcu(&vlan->list);
spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
kfree_rcu(vlan, rcu);
}
/**
* batadv_softif_vlan_free_ref - decrease the vlan object refcounter and
* possibly free it
* possibly release it
* @vlan: the vlan object to release
*/
void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
@ -487,13 +506,7 @@ void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
if (!vlan)
return;
if (atomic_dec_and_test(&vlan->refcount)) {
spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
hlist_del_rcu(&vlan->list);
spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
kfree_rcu(vlan, rcu);
}
kref_put(&vlan->refcount, batadv_softif_vlan_release);
}
/**
@ -514,7 +527,7 @@ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
if (vlan_tmp->vid != vid)
continue;
if (!atomic_inc_not_zero(&vlan_tmp->refcount))
if (!kref_get_unless_zero(&vlan_tmp->refcount))
continue;
vlan = vlan_tmp;
@ -549,7 +562,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
vlan->bat_priv = bat_priv;
vlan->vid = vid;
atomic_set(&vlan->refcount, 1);
kref_init(&vlan->refcount);
atomic_set(&vlan->ap_isolation, 0);

3
net/batman-adv/sysfs.c
View File

@ -25,6 +25,7 @@
#include <linux/fs.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/kref.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
@ -97,7 +98,7 @@ batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
if (vlan_tmp->kobj != obj)
continue;
if (!atomic_inc_not_zero(&vlan_tmp->refcount))
if (!kref_get_unless_zero(&vlan_tmp->refcount))
continue;
vlan = vlan_tmp;

2
net/batman-adv/types.h
View File

@ -746,7 +746,7 @@ struct batadv_softif_vlan {
atomic_t ap_isolation; /* boolean */
struct batadv_vlan_tt tt;
struct hlist_node list;
atomic_t refcount;
struct kref refcount;
struct rcu_head rcu;
};